Crossword Genius

Ban relationship which is formal (5,3)

Ross

I believe the answer is:

black tie

'is formal' is the definition.
(I've seen this before)

'ban relationship' is the wordplay.
'ban' becomes 'black' (I've seen this in other clues).
'relationship' becomes 'tie' (tie is a kind of relationship).
'black'+'tie'='BLACK-TIE'

'which' is the link.

(Other definitions for black tie that I've seen before include "One accompanies DJ" , "Accompaniment of 11" , "Formal evening wear for men" , "Formal (neck)wear" , "It's worn with a dinner jacket" .)

I've seen this clue in The Sun.
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